Hand-punch.



H. ROSENBERG.

HAND PUNCH. I APPLICATION FILED JUNE 19. 1918- 1 ,292,07 3 Patented Jan. 21, 1919.

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HAND PUNCH.

APPLICATION FILED JUNE 19, 191B.

Patented Jan. 21, 1919.

2 SHEETSSHEET 21 awmmtoz Hfyman fiosehhrg 3 m mammaa citizen of the United States,

UNITED STATES PATENT OFFICE.

HEYMAN ROSENBERG, OF NEW YORK, N. Y., ASSIGNOR '10 SAMUEL N. BRIMBERG, OF NEW YORK, N. Y.

HAND-PUNCH.

Specification of Letters Patent Patented J an. 21, 191 9.

Application filed June 19, 1918. Serial No. 240,787..

To all whom it may concern.-

Be it known that I, HEYMAN ROSENBERG, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Hand- Punches; and I do-hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to punches, and more articularly to the type known as hand punc es.

The object is to provide a punch wherein the ratio between the movement of the hand lever and the movement of the punch when cutting is relatively large as compared with prior punch structures; wherein are eliminated all gears which increase friction and which frequently break and require an expensive replacement; and a punch wherein the strain placed upon the parts is direct and in the general direction of the axis of the punch. 4

Another object is to rovide a punch having links connecting t e hand lever to the frame or head wherein the tendency to draw the free ends of the links in. a circular ath- .is unattended by unusual wearing strain a disadvantage found in all practical prior art punches; wherein the fixed ivot of the links is so located as to focus t e center of vibration of the links therein and efi'ect a quick return action of the punch during the period of withdrawal; and wherein the versed sine of' the are passed through is the equivalent of the vertical action of the punch and produces a relatively high ratio of hand motion as compared to that of the punch.

It is designed by this invention to exert a relatively great force or pressure upon the punch at the time of cutting by effecting the reduced advance of the unch at this period; to provide a punch w erein thethrust is more directand powerful than in prior devices; and to provide a punch wherein the parts thereof are inexpensive to produce, to assemble, and to replace.

With these and further objects in view, as

will in part hereinafter become apparent tions and arrangements of parts as subsequently specified and claimed.

In the accompanying drawings,

Figure 1 is a side elevation of a punch constructed according to the present invention, the dotted lines showing the handle partly raised to admit the introduction of a sheet to be punched within the slot of the head. V I

Fig. 2 is an enlarged, transverse section taken through the head of the punch and the parts connected thereto.

Fig. 3 is a side elevation of the punch, showing the punch carrier partly removed from the head.

Fig. 4 is a fragmentary. side elevation of the punch, showing the punch carrier and the point removed from the head.

Fig. 5 is a detail perspective view of the locking bolt.

Referring to the drawings by numerals, 10 designates the head of the punch, which is of usual construction and having a fixed handle 11 and a slot 12, the latter being adapted to receive the sheet of metal or the like to be punched. A die 13 is mounted in the lower jaw of the head and in axial alinement with a guiding recess or perforation 14 formed in the upper jaw of the head. The

head is provided at opposite sides with outstanding studs 15 forming pivot pins upon of side links 16. The studs 15 are in transverse alinement, are located upon the upper jaw of the head 10, and lie in the transverse vertical plane of the axis of the guiding recess 14.

Between the upper ends of the side links 16 is pivotally supported a hand lever 17, the latter being connected to the links by a transverse in 18. The lever 17 has an eccentric pro ection 19 extending substantially at right angles to the longitudinal axis of the hand lever 17 and in a direction to project downwardly toward the head 10 when the hand lever 17 is disposed over the-fixed handle 11. The projection 19 is recessed or bifurcated to receive an ear 20 therebetween, which projects from the upper end of a. punch carrier 21. The ear 20 is pivotally supported in the projection 19 by a transverse pin 22, and is free to swing about the projection upon the pin. The punch carrier 21 is adapted to fit into the guiding recess 14 and carries a punch point 23 adapted to'enter the recess 14 and project through the lower reduced end thereof into the die 13. The punch carrier21 is adapted to be withdrawn from the head 10 to change or renew the punch point 23 without removpunch carrier 21 and its point from thehead, the ear 20 has at its rear side a right angular projection 25 adapted to seat on the upper edge of the head 10 when the carrier is inposition, and the head is provided -with a rotating locking bolt 26 having a lip 27 adaptedto overlie the projection 25 and limit the upward movement of the punch carrier. The bolt 26 is of a length to dispose the projection 27 in spaced relation above the projection 25 when the punch carrier is lowered in the frame to admit of the free play of the punch carrier to release the sheet punched. The bolt 26 is provided at its lowerend with a lug 28 adapted to bear upon the upper edge of the head 10 and which may be grasped by the fingers for turning the bolt 26 to move the projection 27 out of register with the projection 25 of the punch carrier. The shank 29 of the bolt is seated in a recess in the upper face of the head and is held therein by a transverse pin 30 which projects at a tangent to the shank through an annular groove formed in the shank.

In use, the sheet to be punchedis placed in the slot 12. The handle 17 is moved toward the handle 11. This movement turns the handle'17 upon the pin 18 and swings the projection 19 down to force the punch carrier and its point downwardly through the guiding recess 14. As the lower ends of the links 16 lie in the transverse vertical plane of the punch point 23, the upper ends of the links are oscillated through a relat vely small arc, and the movement of the links gradually approaches the zero point as the punch point 23 is brought into cjltting or punching action. tween the movement of the point 23 as compared with the movement of the handle 17 at the cutting period is relatively large, so that considerable force or power is exerted upon the point 23 to effect the cutting action. It is thus evident that a relatlvely .light pressure is required. upon the handle 17. Furthermore, the oscillation of the links 16 is but slight, thus reducing friction and wear on the parts and relatively small movements thereof.

Thus, the ratio be' meaoae Owing to the location of the eccentric projection 19 on the hand lever, the punch point 23 is rapidly raised out of contact with the sheet punched after the hand lever 17 is lifted through a predetermined distance from the fixed handle 11. The point 23 is, therefore, quickly released from the sheet punched. The thrust of the punch is direct as the upper ends of the links approach the transverse vertical plane of the studs 15 at the period of cutting, and the rate of travel of the point 23 is proportionately reduced as the links approach the I,

said vertical plane. This insures an in crease in the pressure of the point 23 as it passes through the material to be punched.

What is claimed is 2-- 1. In a punch,vthe combination of a stationary head having a die therein and a guiding recess in axial alinement with and above the die, side links pivoted to the opposite sides of the head and extending upwardly therefrom, a hand lever pivotally connected between the upper ends of the links and having an eccentric projection.

adapted to normally lie between the links, and a punch carrier pivoted to and carried by the projection and adapted to enter said guiding recess when the handle is in normal position and to be withdrawn from the recess when the handle is overthrown, the guiding recess being formed to snugly receive and guide the punch carrier and having a lateral enlargement at its upper por-' tion located and proportioned to permit passage of the punch at the lower end of the carrier during rocking movement of the carrier as the carrier is withdrawn from the guidingv recess.

2. In a punch, the combination, of a stationary punch head having a die therein and a guiding recess in axial alinement with and above the die, a punch carrier slidable in said recess, a punch point detachably mounted in the carrier and adapted to en gage the die, a handle pivoted to the upper end of the punch carrier, a pair of side links pivotally connecting the head to the handle eccentrically of its connection with the punch carrier, said punch carrier having a projection arranged above said head, and a revoluble locking bolt mounted on the head and having a projection spaced from the head and adapted to be turned into'the path of the projection of the punch carrier to limit the upward movement of the same, said bolt being adapted to the turned to 'move the projection of the bolt out of the ion vertical guiding recess in axial alinement with the die, and having an inclined inner wall, a pair ofside links pivotally connected at their lower ends to the head, a hand lever pivoted at one end between the free ends of the links, a punch carrier pivoted upon said end of the handle eccentrically to the pivoted connection of the links, said 5 punch carrier being adapted to enter said recess when said hand lever is swung over the head in one direction, and adapted to be Withdrawn from the recess when the hand lever is swung in the opposite direc- 10 tion, and a punch point mounted in said carrier adapted to travel in said recess and to clear said inclined wall of the recess when the carrier is withdrawn therefrom.

In testimony whereof I affix my signature in presence of two Witnesses.

HEYMAN ROSENBERG.

Witnesses:

BEN DATTEIBAUM, Cmmws TRo'rsKY. 

